Merge branch 'updating-instructions' into 'master'

 * number of at least one denomination of bills.  So $8 = $1+$2+$5

 * is the same as $8 = $5+$2+1, but different from $5 + 3*$1.

 * 

 * You may use a helper function so long as you solver the problem in a recursive manner.

 *

 * @param dollars The amount of dollars to exchange

 * @return the number of different ways of generating [dollars]

 *    dollars with the permitted bills

 * 

 *

 * @example labFour_pTwo_exchange(8) = 7 corresponding to the

 *   following ways to exchange $8:

 *    1. 8*$1

 * 2. labFour_pZero_Instructor derives from labFour_pZero_Person and has

 *    a salary.

 * Complete the class definitions and implementations, including constructors,

 * destructors, and an external override of stream operator<< and operator>>

 * destructors, setters, getters, and an external override of stream operator<< and operator>>

 * to input and output each object.

 * 

 * When overloading the ostream operators, the output should be formatted such that it includes all fields of the object.

 * @example

 * labFour_pZero_Person James("James");

 * Jim.setBirthday("2010-02-28"); 

 * cout << James; // outputs "James, 2010-02-28"

 * 

 * When overloading the instream operators, the input should be formatted such that it includes all fields of the object.

 * @example

 * labFour_pZero_Person James;

 * std::stringstream input("James, 2010-02-28");

 * input >> James; // inputs "James, 2010-02-28"

 *

 * @example

 * labFour_pZero_Person Jim("James");

 * Jim.setBirthday("2010-02-28"); // Jim's birthday is on February 28, 2010

 * * labFour_pOne_Rectangle - a concrete class representing a rectangle

 * * labFour_pOne_Square - a concrete class representing a square

 * * labFour_pOne_Rhombus - a concrete class representing a rhombus

 * * labFour_pOne_Circle - a concrete class representing a cicle

 * * labFour_pOne_Circle - a concrete class representing a circle

 * FEEL FREE to modify the inheritance structure, as you see fit.

 *

 * EACH concrete class must at least have methods with the signatures noted below